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Common Stock and Stockholders' Equity - Stock Options (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Oct. 31, 2018	Jan. 31, 2018
Outstanding Stock Options
Beginning Balance (in shares)	6,595,486
Stock options assumed (in shares)	1,103,942
Stock options exercised (in shares)	(1,153,579)
Stock options canceled (in shares)	(33,320)
Ending Balance (in shares)	6,512,529
Vested (in shares)	6,446,090
Exercisable (in shares)	5,643,205
Weighted- Average Exercise Price
Beginning Balance (in dollars per share)	$ 4.23
Stock option assumed (in dollars per share)	26.84
Stock options exercised (in dollars per share)	9.10
Stock options canceled (in dollars per share)	15.06
Ending Balance (in dollars per share)	7.14
Vested, Weighted-Average Exercise Price (in dollars per share)	7.41
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 4.58
Aggregate Intrinsic Value	$ 820	$ 763
Vested and expected to vest as of October 31, 2018	810
Exercisable as of October 31, 2018	$ 725

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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